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Can anyone help, I had my bike in on the dyno, on one of the runs it cut out. When taken apart the he said the main earth wire was loose so it was trying to earth out through a smaller wire. Done checks on loom and its looking towards the Ecu. I'm after a zx12r 2000 part number ending 1065 Ecu to try and eliminate it as the fault.
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Donearthru another wire? Is not earth, earth'd? Then, thatherearth wire should have kept going, no? Well, no in a way.

How about main earth was loose? How about scrubbing some bare metal off that main earth from the main wire harness. Say the main has the starter, the 12v ground like keeps the spark grounded; is a main ground fault?

Yes, there are two earths to the bike. One is a 5v earth, the other is a 12v earth. Go chase both grounds, clean down to the metal on both sides so when you bolt it down, those shiny sides are kissing some good ground and you do not question that main wire harness as far as ground integrity to your 5/12 grounds.

Then, go to the fuse box and check all. Then clean the ground strap from the battery to the bike. So, there you go one more time is found pretty much your main 3 grounds with a [new] ground integrity. Razor blade the lead off the battery post like one direction up and that should clean that lead post. Since you have the ground off the battery, now is the time to do the same to the (+) positive side of the battery lead peg. Again, safety razor zip the face of the cables so they too have new, clean, bare metal to make contact with.

Last fundamental move is to find the no run integrity of the wires to the components:

1. Connector not connected. We know the bike was running. What are the odds.
2. Wire out of connector. We did have a runner, but one pin not making contact can drive you nuts, even if you see it connected.
3. Ground or internal ground fault. That means that bare metal scraping has some corrosion between contacts. That means, the ground is not connected making a complete loop. That means, one wire that goes in a coil lets say, comes out the other side. If that coil is just one wire wrapped a certain way like the stator may have 3 wires out of it but it is one continuous wire in, one continuous wire out, makes a loop-de-loop like a W, and out comes one wire; that [if] broken internally, it is that wound of wounds of tiny wire in that coil doing the same thing. All it takes is a break in the chain, inside that coil or inside that stator winding.

Have we made sure we have a running bike on the dyno, someone finds a loose ground cable and tightens it down? How much arch is between that old loose ground? Did you look? Did the guy file that ground is what was the last thing you did to the bike so it is now a boat anchor.
 
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